236 PROCEEDINGS OF THE ACADEMY OF [1881. 



Interradials : one, placed between the upper corners of the first 

 raclials, higher than wide, narrowing toward the summit, extend- 

 ing to the top of the secondary radials, and abutting against the 

 proximal dome plates. The phite at the posterior area is some- 

 what wider, and supports the anal aperture which is almost lateral. 



The dome, according to MUller, is composed of only five plates, 

 but we suggest that probabl}^ his largest plate includes four plates, 

 the spiniferous central vault piece, the two proximal vault pieces, 

 and a small anal plate between them. The four large pi'oximal 

 vault pieces, each crowned with a spine, are no doubt, correctly 

 represented. Those few plates occupy the greater part of the 

 summit, leaving but little space for the radial dome plates, which 

 as yet are unknown. 



Column round, 



Culicoc?-inus, in its form and general habitus, has the closest 

 resemblance to our genus Talarocrinus, which bears the same 

 relation to Dichocrinus as Culicocrinus to Flatycrinus. In 

 Platycrinus and Dichocrinus, all radials above the first plate form 

 a part of the free rays, while in the two other genera all the 

 primary and even the secondary radials are included in the calyx. 

 This genus further differs from Flatycrinus in having three 

 primary radials, a character which distinguishes it also from 

 Marsupiocrinus, the construction of the vault being likewise very 

 distinct. It differs from Gordylocrinus in the arm structure. 



Geological Position, etc. — The only known species is from the 

 Lower Devonian of Germany. 



1855, Culicocrinus nodosus Wirtgen and Zeiler. (Platycr. nodosus.) Verb. Naturh. 

 Verein, xii, p. 15, PI. 6, figs. 2, 3. Miiller, 1855. Culicoor. nodoEUS. Ibid., 

 p. 24, PI.. 8, figs. 1-4. Grauwacke. Near Coblentz, Germany. ► 



This species is known onl}^ by impressions left in the rock, and 

 casts taken therefrom. 



4. MARSUPIOCRINUS Pbillips. 



(Not Marsupicrinites Blainville = Marsupites Mant., 

 nor Marsupiocrinites Hall. = Lyriocrinus). 



1839. Phillips apud Murchison, Silur. System., p. 672. 



1842. Austin. Ann, Mag, Nat. Hist,, x, p, 109, 



1843, Austin, Ibid., xi, p. 198. 



1857. Pictet. Traite de Paleont., iv, p. 332. 

 1878. Augelin. Icon, Crin, Suec, p, 2. 



